What i think about Lunar boss is UFO. a huge UFO that is
spawning aliens with S.D.M.G's. an alien has 5% to drop an
S.D.M.G.

Space parts: (the UFO will drop one of those)

Rocket Engine (25%)

Space Glass (25%)

Gravity Machine (25%)

Space Turbo (25%)

Can drop also:

UFO trophy

S.D.M.G 40%

70% Ray Gun

Golden Cog (Summons a robot pet that will fight for you) 15%

40-70 souls of flight 100%

30-40 Space Ingots.

CRAFTING:

With Rocket Engine, Space Glass, Gravity Machine, Space Turbo,
40 Space Ingots and 50 souls of flight you can make a small space
ship. With this space ship you can travel to Moon, Venus, Mars,
Jupiter and Neptune.